mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    def ask(x, y):
        print("?", x, y)
        sys.stdout.flush()
        return int(input())

    N = int(input())
    st = list(range(1, N+1))
    op = [[] for _ in range(N+1)]
    while len(st) > 1:
        st_new = []
        for i in range(len(st) // 2):
            x = st[i * 2]
            y = st[i * 2 + 1]
            op[x].append(y)
            op[y].append(x)
            z = ask(x, y)
            st_new.append(z)
        if len(st) & 1:
            st_new.append(st[-1])
        st = st_new
    first = st[0]
    second_list = op[first]
    x = second_list[0]
    for y in second_list[1:]:
        x = ask(x, y)
    print("!", x)
    sys.stdout.flush()


if __name__ == '__main__':
    main()